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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '899a111cbf648a3c06ac37ef33ebfc3674188b9bb8cc634b6fe32dcc73dd1812' 
  AND token = 'G3PH8JsbnUOToZdg+Fl7tq4s1+/30rtJePyzo78y6gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}